Oh, the irony
Towards the end comes this nightmare scenario:
Tomorrow’s children, therefore, unlike members of the postwar baby boom generation, will be for the most part descendants of a comparatively narrow and culturally conservative segment of society. To be sure, some members of the rising generation may reject their parents’ values, as always happens. But when they look around for fellow secularists and counterculturalists with whom to make common cause, they will find that most of their would-be fellow travelers were quite literally never born.There are some problems when it comes to applying the theory to reality. For one thing, the authors claim that "Among states that voted for President George W. Bush in 2004, fertility rates are 12 percent higher than in states that voted for Sen. John Kerry." This may be true, but it ignores the fact the most states in 2004 only tilted one way or the other by the smallest of margins. In many cases, Arkansas and Alabama among them, the difference was less than one percentage point.
But overall, I find it hard to find fault with the thesis. The result will be rather ironic, considering the positive correlation between belief in creationism and family size. In other words, the less likely one is to believe in evolution, the more likely it is that evolutionary processes will ensure one's culture comes out on top.